Boot upper



FIG. 1 is a side elevational view of the boot upper; and,

FIG. 2 is a perspective view of the boot upper.

The portions shown in dash-dash broken lines are solely for the purpose of illustrating context, environment or other unclaimed areas and form no part of the claimed design. The dash-dot broken lines depict boundaries between claimed and unclaimed portions. 

CLAIM The ornamental design for a boot upper, as shown and described. 